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Consolidated Statements of Stockholders' Equity Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2017   58,319,348      
Beginning balance at Dec. 31, 2017 $ 158,516 $ 58 $ 866,206 $ (707,255) $ (493)
Exercise of options to purchase common stock, net of shares withheld and retired to satisfy cashless exercises (in shares)   114,042      
Exercise of options to purchase common stock, net of shares withheld and retired to satisfy cashless exercises 2,961   2,961    
Stock-based compensation expense 8,181   8,181    
Restricted stock units vested, net of shares withheld for taxes (in shares)   289,852      
Restricted stock units vested, net of shares withheld for taxes (11,815) $ 1 (11,816)    
Debt retirement (12)   (12)    
Net income (loss) (6,569)     (6,569)  
Other comprehensive loss (1,043)       (1,043)
Ending balance (in shares) at Mar. 31, 2018   58,723,242      
Ending balance at Mar. 31, 2018 $ 170,568 $ 59 865,520 (693,475) (1,536)
Beginning balance (in shares) at Dec. 31, 2018 59,188,758 59,188,758      
Beginning balance at Dec. 31, 2018 $ 212,099 $ 59 898,559 (683,614) (2,905)
Exercise of options to purchase common stock, net of shares withheld and retired to satisfy cashless exercises (in shares) 273,082 269,473      
Exercise of options to purchase common stock, net of shares withheld and retired to satisfy cashless exercises $ 9,061 $ 1 9,060    
Stock-based compensation expense 5,784   5,784    
Restricted stock units vested, net of shares withheld for taxes (in shares)   180,208      
Restricted stock units vested, net of shares withheld for taxes (7,512)   (7,512)    
Net income (loss) 4,378     4,378  
Other comprehensive loss $ (180)       (180)
Ending balance (in shares) at Mar. 31, 2019 59,638,439 59,638,439      
Ending balance at Mar. 31, 2019 $ 223,630 $ 60 $ 905,891 $ (679,236) $ (3,085)